The crushed rock is combined with other ingredients such as iron ore or fly ash and ground, mixed, and fed to a cement kiln. The rock then goes to secondary crushers or hammer mills for reduction to about 3 inches or smaller. The first crushing reduces the rock to a maximum size of about 6 inches. The first step is to quarry the principal raw materials, mainly limestone, clay, and other materials. The most common way to manufacture portland cement is through a dry method. The labs also analyze and test the finished product to ensure that it complies with all industry specifications. With this crude method, he laid the foundation for an industry that annually processes literally mountains of limestone, clay, cement rock, and other materials into a powder so fine it will pass through a sieve capable of holding water.Ĭement plant laboratories check each step in the manufacture of portland cement by frequent chemical and physical tests. These ingredients, when heated at high temperatures form a rock-like substance that is ground into the fine powder that we commonly think of as cement.īricklayer Joseph Aspdin of Leeds, England first made portland cement early in the 19th century by burning powdered limestone and clay in his kitchen stove. Concrete is formed when portland cement creates a paste with water that binds with sand and rock to harden.Ĭement is manufactured through a closely controlled chemical combination of calcium, silicon, aluminum, iron and other ingredients.Ĭommon materials used to manufacture cement include limestone, shells, and chalk or marl combined with shale, clay, slate, blast furnace slag, silica sand, and iron ore.
Portland cement is the basic ingredient of concrete.
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